Minimum Slope For Concrete Tile Roof

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Minimum slope for concrete tile roof.

Roofs steeper than 35º generally present sufficient obstruction to the wind for a positive. Both clay and concrete tile are available in many colors and are naturally weather resistant. The irc recommends a minimum pitch of 2 5 12 for these materials. The underlying roof provides all the necessary waterproofing.

If a customer insists on installing roof tiles on a roof with a pitch below 3 12 consult the tile manufacturer for installation specifications. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. When the roof angle is less than 30º the windward slope can be subjected to severe suction or negative pressure fig 4. Fixing tile roofs in cyclonic regions 15 minimum roof pitch 15 maximum rafter lengths 15 maximum rafter lengths no sarking 15.

Minimum roof slope roof pitch r905 3 2 clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater. However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. Boral concrete tiles are manufactured using an extrusion process. Low slope applications will require a carefully detailed waterproof membrane for example a self sticking bituminous membrane under the tiles.

A frame roof a steep pitched gable roof each slope extending from close to the ground line to meet at the top ridge. And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply. Sunday july 1 2018 the international residential code irc specifies a minimum 4 12 pitch 4 inches of vertical rise for every 12 inches of horizontal run for a clay or concrete tile roof except that a pitch as low as 2 1 2 12 is allowed when two layers of underlayment are applied. Clay tiles are colorfast which means their tints improve rather than fade over time.

Concrete is long lasting with a minimum lifespan of 50 years depending on climate. Asphalt shingles continue to be the most widely installed roof covering option in north america. In general the minimum slope for a tile roof is 3 12. This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.